Electric-arc lamp



(No Model.) 3 SheetsSheet 1.

G. E. BALL.

ELECTRIC ARC LAMP.

No. 260,925. Patented July 11, 1882.

" JNVENTOR Atria ENE r5 (No Model.) 3 Sheets-Sheet 2.

0. E. BALL ELECTRIC ARC LAMP. No. 260,925. Patented July 11, 1882.

j/v VEA/TOR WIT ESSEX (No Model.) 3 Sheets-Sheet 3.

C.E.BALL. ELECTRIC ARC LAMP.

No. 260,925. Patented July 11, 1882.

v [/YVZf/YZ'OR Wan/Emm- 2, WWW M flag, $10664 ATTOfP/VEYY UNiTED STATESPATENT @Frrcn.

CHARLES E. BALL, OF PHILADELPHIA, PENNSYLVANIA.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 260,925, dated July 11,1882.

Application filed May 3, 1882.

To all whom it may concern:

Be it known that I, CHARLES E. BALL, a

citizen of the United States, residing at- Philadelphia, in the countyof, Philadelphia and State of Pennsylvania, have invented certain newand useful Improvements in Electric-Arc Lamps; and I do hereby declarethe following to be afull, clear, and exact description of theinvention, reference being had to the accompanying drawings, which formpart of this specification, in which- Figure l is a side elevation. Fig.2 is a ver tical section; Fig. 3, a top view; Fig. 4,aside elevationwith a. portion of the frame broken away to show the eseapement. Fig. 5is a detail plan view. Fig. 6 is a front elevation, and Figs. 7 and 8are detail views of my improvement.

My invention has for its object to provide an electric lamp with meansfor feeding the carbon by a positive motion corresponding to ordependent upon the consumption of the carbons and not at a uniform timerate of speed.

A still further object of my invention is to provide means for movingthe carbonholder so as to avoid backlash or slip between teeth.

A still further object of my invention is to provide means whereby thecarbon-holders of electric lamps may be weighted, so as to render themovement of a series of such holders uniform. I

My improvements consist in the peculiar construction and combination ofparts, having reference chiefly to the following points: first,

'to the combination, with the tilting feeding mechanism ofan electriclamp, of an automatic stop of peculiar construction, whereby after theare has been established the feed will be arrested until by theconsumption of the carbons such are fails or weakens, whereupon the stopis released and the feed renewed 5 second, to the construction of thestem of the carbonholder with a worm or spiral thread, so as to insureconstant engagement with an engaging pinion, and thus avoid backlash orthe slip which occurs between the teeth of a rack such as is ordinarilyemployed; third, to the combination,with a hollow carbon-holder, ofpelletweights for adjusting a series of holders so as to cause them todescend with uniformity.

(No model.)

Referring to the accompanying drawings, A indicates the frame of anelectric lamp; B, the negative or stationary carbon in afixed holder, B,and O the positive or movable carbon in a sliding holder, D. Said holderD consists of a hollow tube having hearings in the plates a a of theframe A, and provided at its lower end with a clamp, d, in which thecarbon (J is fastened. The upper end of said holder fits and movesfreely in a surrounding tube, E, whose lower end is firmly secured tothe plate a of the frame A, its upper end having a nut, 6, with eye 0,which afl'ords a point of suspension for the lamp. The tube D is formedwith an external worm or spiral thread, (1, and an internal floor orpartition, (1 designed to receive shot or small balls or pellets (l toweight theholder, such shot beingintroduced through the open upper endof the tube D.

F and F represent electro-magnets, the first named being wound withcoarse wire located in the main circuit, the other being wound with finewire, so as to have a high resistance, and being located in theshunt-circuit. The coils of the magnet F are partly exposed or naked,having a portion of their insulation removed, as shown at f, so as topermit contact with any one of such coils by a sliding head, G, havingaset-screw, g,whereby it is held in any adjusted position on a rod, g,which depends from the plate a of the frame A.

H represents a sliding core, common to both of the magnets F F, (thelatter being in alignment vertically,) and forming the armaturetherefor.

I represents a rectangular frame, fulcrumed at i t in brackets a? a",projecting from the side posts, a a, of the main frame A. Said frame ispivotally connected at h with the armature H, so that as the latter ismoved up or down said frame I is vibrated or tilted on its fulcra.

I represents a rod secured to the frame 1 at i, and extending outwardhorizontally, ornearly so. It carries a. sliding weight, '5 whereby saidframe may be counterbalanced more or less, according to the pull of themagnet F on armature H. The frame I affords bearings for a shaft, K,carrying a beveled pinion, 7;,which gears with the worm or spiral thread(1 on the carbon-holder. Said shaft II also carries a gear-wheel, k,which engages with a wheel, I,

on another shaft, L, supported in said frame I 0 represents a lever ordog pivoted at 0 on one of the frame-posts a and connected with thetilting frame I by a link, P, having-adjusting-nuts p p on its upperend. Said dog 0 has teeth 0' 0 on its upper side, with which the lowerblade, at, of the fan N engages, as hereinafter set forth. The circuitis as follows: entering at the binding-post 1 in the frame A, thence bya copper plate or brush, q, to the carbon-holder D, then down throughthe carbons B O and up the frame-rods a a which are insulated by agutta-percha plate, a, to a post, 2, thence to the main coil F, thenceto the slidingblock G on the rod g, and from the latter to thebinding-post 3,which is insulated, as shown at a, from the frame-platea, and onward to line. The shunt-circuitin which magnet F is located isfrom post 4, in circuit with plate a, to metallic headf, thence throughcoil of said magnet, thence by wire 5 to rod 9, to

binding-post 3.

The operation is as follows: The lamps which are intended to be arrangedin a series in one circuit are first regulated so that their slidingcarbon-holders will move at a uniform rate of speed, which is effectedby introducing shot into such holders and timing the descent of thelatter; The lamps being next placed in circuit with a dynamo-machine orother source of electric energy and the current turned on, the slidingheads G are moved up or down,

as required,until the resistance of the coils Fis graduated so that theframes I will each belifted easilyand with little or no shock or noise.The

stop-motion is next adjusted by turning the screws 1) 1), so as toregulate the distance between the edge of the fan-blade a and the bottomof the spaces between the teeth 0, according to the length of are whichit is desired to obtain. The weights i on the horizontal rods 1 are nextmoved in or out, (as may be required to counterbalance the frames I,accordthe blade-n. of the fan or lever N, locking the shaft M, on whichsaid fan is mounted, and preventing the gearing composed of escapementm, wheels Z k, and pinion from running. This holds the movablecarbon-holder stationary. As the carbons become consumed and the arelengthens its resistance increases, until finally the current, or aportion of it, passes to the shunt-magnet F, energizing the latter. Saidmagnet F now pulls down the armature H and tilts the frame Icorrespondingly, the v dog 0 dropping, so as to release its hold on theits resistance was greater than that of the shunt-magnet F the carbondescends merely enough to bring the points a proper distance apart,whereupon the frameis tilted and locked, as before. When thecarbon-holder D is descending the engagement of the worm with the pinionIt gives a rotary motion .to the latter and a rocking motion to theshaftM, vibrating the fan N and preventing said carbonholder fromrunning down too fast. The descent of the carbon-holder D is due partlyto its gravity and partly to the pull of the magnet F. The pinion k isclutched on the shaft K, so that when the holder D is descending thegearing in frame I will run, as described,

v.but when said holder is ascending the pinion is loose on its shaft andthe rest of the gearing does not run.

What I claim as my invention is- 1. The combination, with thecarbon-holder D and tilting frame I, carrying a lever or fan, F, of thepivoted dog 0, having an adjustable link-connection, P,substantiallyasshown and described.

2. The carbon holder D, having aspiral thread or worm, d, in combinationwith pinion is, substantially as shown and described.

' 3. The hollow carbon-holder D, in combination with pelletregulating-weights dflsubstantially as described.

In testimony that I claim the foregoing I have hereunto seumy hand this28th day of .April, 1882. I

' CHAS. E. BALL. Witnesses:

O. S. BRADFORD, J r., UHAs. F. VAN HORN.

